Silicon derivative, liquid crystal composition comprising the same and compensation film using the same liquid crystal composition

Abstract

Disclosed are a silicon derivative, a liquid crystal composition comprising the same, and a compensation film for a liquid crystal display device using the same liquid crystal composition. More particularly, the silicon derivative is a liquid crystal material of a high-quality view angle compensation film, which improves a contrast ratio measured at a tilt angle when compared to a contrast ratio measured from the front surface and minimizes color variations in a black state depending on view angles.

1. A silicon derivative represented by the following Formula 1: 
       
         
           
           
               
               
           
         
         wherein G 1  is 
       
       
         
           
           
               
               
           
         
         W 1  represents —H, —CH 3 , —CH 2 CH 3 , —F, —Cl, —Br or —CF 3 ; 
         X 1  is —O—, —NH— or —(CH 2 ) m —, and m is an integer of 0˜5; 
         A 1  is a C 1 ˜C 12  alkylene, C 2 ˜C 12  alkenylene, —(CH 2 CH 2 O) n —, —(CH 2 CHCH 3 O) n — or —(CHCH 3 CH 2 O) n —, and n is an integer of 1˜5; 
         each of Y 1  and Y 2  independently represents —O—, —NH—, —(CH 2 ) p —, —CH═CH—, —C≡C—,—C(═O)O—, —OC(═O)—, —C(═O)—, —SiH 2 —, SiMe 2 —, —SiEt 2 -, —CH 2 SiH 2 —, —CH 2 SiMe 2 —, —CH 2 SiEt 2 -, —SiH 2 CH 2 —, —SiMe 2 CH 2 — or —SiEt 2 CH 2 —, and p is an integer of 0˜2; 
       
       
         
           
           
               
               
           
         
         J 1  is —CH 2 SiH 2 —, —CH 2 SiMe 2 -, —CH 2 SiEt 2 -, —SiH 2 CH 2 —, —SiMe 2 CH 2 — or —SiEt 2 CH 2 —; 
         E 1  is 
       
       
         
           
           
               
               
           
         
         each of a and b independently represents an integer of 0˜2; 
         each of Q 1 ˜Q 4 , R 1 ˜R 4  and R 6 ˜R 9  independently represents —H, —F, —Cl, —Br, —I, —CN, —OH, —CH 3 , —CH 2 CH 3  or —C(═O)CH 3 ; and 
         R 5  is —SiMe 3 , —SiEt 3 , —SiF 3 , —H, —F, —Cl, —Br, —I, —CF 3 , —CN, —OH, —OCH 3 , —OCH 2 CH 3 , —OCF 3 , a C 1 ˜C 12  alkyl or a C 2 ˜C 12  alkenyl; 
         with the proviso that the compound of Formula 1 has at least one —Si—. 
       
     
     
       2. A silicon derivative represented by the following Formula 2: 
       
         
           
           
               
               
           
         
         wherein each of G 1  and G 2  independently represents 
       
       
         
           
           
               
               
           
         
         W 1  represents —H, —CH 3 , —CH 2 CH 3 , —F, —Cl, —Br or —CF 3 ; 
         each of X 1  and X 2  independently represents —O—, —NH—or —(CH 2 ) m —, and m is an integer of 0˜5; 
         each of A 1  and A 2  independently represents a C 1 ˜C 12  alkylene, C 2 ˜C 12  alkenylene, —(CH 2 CH 2 O) n —, —(CH 2 CHCH 3 O) n — or —(CHCH 3 CH 2 O) n —, and n is an integer of 1˜5; 
         each of Y 1 ˜Y 4  independently represents —O—, —NH—, —(CH 2 ) p —, —CH═CH—, —C≡C—, —C(═O)O—, —OC(═O)—, —C(═O)—, —SiH 2 —, —SiMe 2 —, —SiEt 2 —, —CH 2 SiH 2 —, —CH 2 SiMe 2 -, —CH 2 SiEt 2 -, —SiH 2 CH 2 —, —SiMe 2 CH 2 — or —SiEt 2 CH 2 —, and p is an integer of 0˜2; 
       
       
         
           
           
               
               
           
         
         each of J 1  and J 2  independently represents —CH 2 SiH 2 —, —CH 2 SiMe 2 -, —CH 2 SiEt 2 -, —SiH 2 CH 2 —, —SiMe 2 CH 2 — or —SiEt 2 CH 2 —; 
         each of E 1  and E 2  independently represents 
       
       
         
           
           
               
               
           
         
         each of a, b, c and d independently represents an integer of 0˜2; and 
         each of Q 1 ˜Q 8 , R 1  ˜R 4  and R 6 ˜R 9  independently represents —H, —F, —Cl, —Br, —I, —CN, —OH, —CH 3 , —CH 2 CH 3  or —C(═O)CH 3 ; 
         with the proviso that the compound of Formula 2 has at least one —Si—. 
       
     
     
       3. The silicon derivative according to  claim 1 , wherein the C 2 ˜C 12  alkenylene as A 1  is —CH═CH—, —CH═CCH 3 —, —CH 2 CH═CH—, —CH═CHCH 2 CH 2 —, —CH 2 CH═CHCH 2 —, —CH 2 CH 2 CH═CH—, —CH═CHCH 2 CH 2 CH 2 —, —CH 2 CH═CHCH 2 CH 2 —, —CH 2 CH 2 CH═CHCH 2 —, or —CH 2 CH 2 CH 2 CH═CH—; and the C 2 ˜C 12  alkenyl as R 5  is —CH═CH 2 , —CH═CHCH 3 , —CH 2 CH═CH 2 , —CH═CHCH 2 CH 3 , —CH 2 CH═CHCH 3 , —CH 2 CH 2 CH═CH 2 , —CH═CHCH 2 CH 2 CH 3 , —CH 2 CH═CHCH 2 CH 3 , —CH 2 CH 2 CH═CHCH 3 , or —CH 2 CH 2 CH 2 CH═CH 2 . 
     
     
       4. The silicon derivative according to  claim 2 , wherein each of the C 2 ˜C 12  alkenylene as A 1  and A 2  independently represents —CH═CH—, —CH═CCH 3 —, —CH 2 CH═CH—, —CH═CHCH 2 CH 2 —, —CH 2 CH═CHCH 2 —, —CH 2 CH 2 CH═CH—, —CH═CHCH 2 CH 2 CH 2 —, —CH 2 CH═CHCH 2 CH 2 —, —CH 2 CH 2 CH═CHCH 2 —, or —CH 2 CH 2 CH 2 CH═CH—. 
     
     
       5. The silicon derivative according to  claim 1 , which has stereoisomers and the stereoisomers are present in a ratio of [trans-isomer:cis-isomer] of 85:15˜100:0. 
     
     
       6. The silicon derivative according to  claim 2 , which has stereoisomers and the stereoisomers are present in a ratio of [trans-isomer:cis-isomer] of 85:15˜100:0. 
     
     
       7. A liquid crystal composition comprising at least one silicon derivative selected from the group consisting of the silicon derivative represented by the following Formula 1 and the silicon derivative represented by the following Formula 2: 
       
         
           
           
               
               
           
         
         wherein G 1 , X 1 , A 1 , Y 1 ,Y 2 ,ring B, ring C, J 1 , E 1 , a, b and R 5  are the same as defined in  claim 1 ; and 
       
       
         
           
           
               
               
           
         
         wherein G 1 , G 2 , X 1 , X 2 , A 1 , A 2 , Y 1 ˜Y 4 , ring B, ring C, ring D, J 1 , J 2 , E 1 , E 2 , a, b, c and d are the same as defined in  claim 2 . 
       
     
     
       8. The liquid crystal composition according to  claim 7 , wherein each silicon derivative contained in the liquid crystal composition is used in an amount of 1 ˜80 wt % based on the total weight of the composition. 
     
     
       9. A compensation film for liquid crystal display device, which comprises the liquid crystal composition as defined in  claim 7 . 
     
     
       10. The compensation film for liquid crystal display device according to  claim 9 , wherein each silicon derivative contained in the liquid crystal composition is used in an amount of 1 ˜80 wt % based on the total weight of the composition. 
     
     
       11. The compensation film for liquid crystal display device according to  claim 9 , which is an A-plate type compensation film, a B-plate type compensation film, a (+)C-plate type compensation film, or a (−)C-plate type compensation film.